In order to enable the outflow direction of a fluid to be changed and to enable the outflow position of the fluid to be freely set, a nozzle device (7) of the present invention comprising: a flow path body that flows or holds a fluid and that has a flow path wall (6); and a nozzle unit (1) including a nozzle body (3) having a spherical surface on an outer periphery thereof and having a fluid passage (3a) formed thereinside, a holding mechanism of the nozzle body (3), and a securing member (4) that fixes the holding mechanism to the flow path wall (6), wherein the holding mechanism is made of a pair of thin plate members (2), each having a contact holding portion (2b) in contact with the spherical surface of the nozzle body (3) and having a flat portion (2a), and the holding mechanism rotatably holds the spherical surface in a state in which the nozzle body (3) is sandwiched by the contact holding portions (2b) of a pair of the thin plate members (2).